Sorry, correct galvanic corrosion!!!
ps Knowledge bomb. 2 arsenic is added to brass to aid in preventing dezincification.
Yep (and manufacturers usually get that part right), however…
knowledge bomb No.3: Arsenic only prevents DZ of the alpha phase of the brass (brass less than 35% Zn, from memory, is practically 100% alpha phase). The Beta phase still suffers from DZ. A mixed alpha beta phase structure (as found in forged fittings, cos beta phase is easier to forge) requires the beta phase to be distributed in a non continuous network so that dezincification of the beta phase can’t destroy the component. That’s where the testing i mentioned earlier comes in (AS2345).
Note that Moar zinc = moar beta = easier to forge = moar cheaper = moar DZ
here’s something GIS prepared earlier:
We now return you to your regularly scheduled programming…